Researcher Finds CSS-Only Method to Track Mouse Movements – was able to do this by creating a grid of HTML DIVs that utilize CSS :hover selectors to request a new background image when your mouse moves over a box on the grid
https://www.bleepingcomputer.com/news/security/researcher-finds-css-only-method-to-track-mouse-movements/

Submitted May 09, 2019 at 09:41AM by magenta_placenta
via reddit https://www.reddit.com/r/programming/comments/bmkmqk/researcher_finds_cssonly_method_to_track_mouse/?utm_source=ifttt